Eeinhold adlung



(No Model.)

R. ADLUNG. PNPUMATIG' PUMP.

Patented sept. 28, 1886.

r, .M v h N PETERS. PIwlo-Lnmgmprmr. wuhingnon, D. C.

UNITED STATES PATENT OFFICE.

REINHOLD ADLUNG, or PANKOW, GERMANY.

PNEUMATIC PUMP.

SPEGFCATION forming part of Letters Patent No. 349,777,l dated September 28, 1886.

Application tiled October 28, 1884. Serial No. 146,783. (No model.) l

To all whom, it may concern.-

Beit known that l, REINHOLD ADLUNG, of Pankow, in Germany, have invented a new and useful Improvement in Pneumatic Pumps, of which the following is a specification. v

My invention has for its object to provide a lcheap and convenient appliance for producing a vacuum, and is chiey intended for the use of dentists, surgeons, and physical and chemical laboratories.

In the accompanying drawings, Figure 1 is an axial section of a pump embodying my-invention; Fig. 2, an axial section ofthe principal parts in operation, while Fig. 3 shows a detail, and Fig. 4 a modification.

The invention chiefly comprises a rigid casing, G, an expansible displacer, B, placedin the said casing, inlet, and outlet valvcs,'and means for operating the valves.

To the casing G, composed of two parts united by a screw-joint, is attached an elastic ball, A, provided with a suction-valve, s.

The casing G is provided with two valves, m and n, for the inlet and outlet of air, n being adapted to open inside by suction, while the valve m is a discharge-valve for atmospheric air.

The casing G contains an elastic displacer, B, preferably of india rubber, communicating at the bottom with the ball A through a valve, p, and at the top with the atmosphere by a peculiarly-constructed valve mechanism, which is shown in detail by Fig. 3.

To the inside of the rigid casing G is fixed an elastic plate, g, so as to form a small compression-chambery@ which communicates with the upper valve mechanism'by a pipe, Z. (Represented in the drawing-s by a dotted line.) The outer wall of the chamber fr may either be formed by the casing G, as shown in Fig. 1, or by a removable lid, as indicated by Fig. 4, in which case the casing G has a correspondingly large opening.

The valve apparatus shown inFig. 3 comprises a `valve-box, h, carrying two valves, c and w, and the iieXible membrane t', adapted to act on the valves c and w at the required moment.

The apparatus works as follows: It' the ball A -is compressed, the compressed air passes through valve p into the displacer B and eX- pands the same. The air situated between' B and the casing G passes through Valve m into the atmosphere. 'If the displacer is sufficiently expanded, a :pressure is exerted on the elastic plate g and transmitted through the air in the chamber r to the membrane i in the valve-box 7L by the elastic connection Z. rlhis pressure opens the valve lw and permits the compressed air in the displacer B to escape through port t and aperture minto the atmos. phere.

For the purpose of maintaining the valve o open after the compression in the chamber r has ceased, the valves w and c are so connected with each other that in the lowest position of the valve w the valve c is open. The press'- ure in B now acts on the upper side of 'the diaphragm i, and asthe valves c and w are completely balanced' by means of springs, they are constantly kept open until the pressure in B is equal to that of the atmosphere. Only a fresh compression of the ball A or the closing pressure of the springs will press the valves o and w against their seats, so as to interrupt communication between B and h. The displacer B, expanded by the internal air-pressure, has forced the air contained in G through `valve m toward the outside, and is in a state of tension. If, now, the valves c and w are opened, as above described, the displacer B is contracted and a vacuum is produced loetween the latter and the casing G. The vacuum thus producedmay be transmitted to avacuumreservoir, and increased by alternately compressing thel ball A and allowing the same to expand.

The details of construction may be modified in various manners. For instance, the conical valves and iiaps, as represented, may bereplaced by lip-valves or other well-known closing devices, and the Valve mechanism arranged f on the exterior may be placed in the interior of the displacer B.

The vacuum apparatus described is conspicuous by its simplicity and the absence of frictional surfaces which would require lubrication. p

1. In vacuum pumps with elastic dia- IOO 10 the displacer B, with the auxiliary aircl1amber r, and with the atmosphere, the said valve mechanism being controlled by the pressure in the auxiliary air-chamberr, and adapted to establish communication between the displacer and the atmosphere When the chamber 'r is compressed, substantially as described.

2. In vacuum-pnmps with elastic diaphragm, the combination of casing or shell Gr with displacer B, air-chamber r, valve-casing h, connected withv chamber i', and having a port, t, and outlet x, valves/U and w, and eXible diaphragmI i, substantially as and for the purpose described.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses.

REINHOLD ADLUNG.

Witnesses:

MAX WERNIQKE, B. Roi. 

